Tractor mounted spring tooth harrow



Qct. 24, 1950 C, 1 CQOK E -r AL 2,527,355

TRACTOR MOUNTED SPRING TOOTH HARROW Filed March 28, 1947 2 Sheets-Sheet l I N VEN TORS ATTORNEYS Qct. 24, 1950 c. L. COOK ErAl.

TRACTOR MOUNTED SPRING Too'm HARRow l2 sheets-sheet 2 Filed March 28; 1947 ik: :www www@ Lm l INVENTORS Y CURTISS L. COOK, AUSTIN E. YOUNG Patented Oct. 24, -195() UNITED STATES PATENT OFFICE 2521355 l TRACTORMOUNTED SPRING TOOTH l Y HARRQW i i Curtiss L. Cook and Austin E. Young, Syracuse, v N. Y., assignors toSy'racuse'lChilled Plow Co., Inc., Syracuse, N. Y., a corporation of New York Application March 28, 19457,`Serial No. 731,776

The present'inventio'n relates generally lto ag# ricultural machines and more particularly to in'- tegralo-r tractor mounted implements. y

' The object and general natureof the "invention'is the provision of a new'and improved integral implement which' may be quickly'and easily attached to or detached from its supporting tractor andA in which the implement may readily be attached to the tractor by backing theftrac'- tor into'the implement with the drawbar raised, then lowering the drawbar slightlyj and then driving forwardly. f ,fIt is a more particularobjectof this invention` to ,provide new and improved means 'for at; taching the rear end. of `the implement to the drawbar of the tractor so, as to allow for quick and easy attachment and detachmentof the-im# plement from `the tractor;Y and which when Vatv` tached, connects the implement vvto the drawbar so as to'prevent any displacement of the implement. f These and other objects and'advantages ofthe present invention will be readily apparent to those skilled inthe art after a consideration of the following detailed description, takenv in conjunction with the accompanying drawings,Y vin which theprefe'rred form of the present invention has been illustrated.

fthe drawings: Y, .li'igure 1 kis a side elevational view vof a quick att'achalcleA implement, such aus 'afspring tooth har'ro'w,l showing itmounted Qin:- position on its propelling and supporting tractor, one wheel of the tractor being removed for clarity.

Figure 2' is a plan-view of the implement shown Figure 1, the tractor being indicated in dotted lines so as t show the implement parts as clearly aspossible. K y y'. "f

Figure 3 isa sectionaldyiew taken vgenerally along the line 3--3 of Figure '2.

Figure 4 is a detail section through theforward tractor bail. l Y

I Figure 5 is a view of a modification of the cam retaining structure."""^ V Y Figure 6 is'v a fragmentary view showing the front end supported on the stand ready to be at' tached to the tractor. 'l v' Referring now to the drawings, particularly Figures `1 and 2, the referencel numeral I` indicates a farm tractorV of the four, wheel type, hav-.- ing Yfront and rear wheels -2 fand'3 journaledior rotation on axle means 5 and 6. The tractor includes power means 1 anda power lift unitV 8` ofv the hydraulicetype, including suitable vvalve mechansmv and'other necessary parts, such'as licoiaim's. (onor-Jn) apair of lift arms Il and chains I2 connecting the arms H to a pair of lugs I3 formed on the side members Hl' of a generally vertically swingable tractor drawba-r or bail -member l5. The latter is preferably in the form of a Ushaped member and includes a rear transverse section or bar IE which may be formed of round stock. The sides i4 may be of welded pressed` metal construction and are pivotedA at their'front ends, as at i1,to drop housings I8v which form a part of the-'tractor rear axle structure 9. Preferably the rear part I6 is welded or otherwise permanently secured to the side parts I4 of the tractor drawbar or bail l5. The two power lift arms Il are clamped or otherwise fixed in any suitable manner to the ends of a power lift rockshaft 20 which forms a part of the 'hydraulic unit 8.

'L As best shown in Figures 1 and 2, one of the implements that may easily and quickly be attached" to and detached` from the tractor is a spring tooth barrow, indicated in its entirety by the reference numeral 30. The implement 3D includes two tooth bars 3i and 32 which are generally U-shaped and are inverted so that their flanges extend downwardly. The too-th bars 3l, 32 extend transversely and are connected together near their extremities by tooth bar braces 33,.

which may be in the form 0f angle irons. The tooth bars 34,132 have Securely fastened to them by clamping means 3A a plurality of spring teeth Y35. As bestrshown in Figure 1, the clamping means 3d includes a U-shaped tooth holder 33 which is apertured and'threaded atv its base to receive a set screw 31 and which is apertured near the outerends of its flanges to receive a spring tooth 35. The setfscrew 31 bears against the tooth bar .3l or 32, and upon tightening the set screw 31, the lflanges of the tooth bar 3| or 32 irmly abut against the tooth 35`and hold it securely fin Aposition. Afpair of laterally spaced generally longitudinally extending beams d5, 46 are rigidly xed in any suitable manner at their rear ends to the tooth barsV 3i, 32, and are preierablyvof angle iron construction. The beams 45, 46 bend downwardly intermediate their ends andy converge slightly at their forward ends. Beams 45 and 46 have connected attheir forward ends in any suitable manner, strapv members 41 and 48 which extend forwardly and convergently to form a V. At their forward ends they are connected together and spaced apart to' receive between them a swngable implementstand 49 which is apertured at its upper end to receive a pivot bolt B (Figure 4) passing through the registered openings in straps 4l and 48. The implement stand 49 is fashioned at its lower end so as to present a substantially horizontal surface when the stand 49 is hanging vertically. The members 41, 48 extend forwardly underneath the rear axle 6 of the tractor and at their forward ends rest in a vertically shiftable bail member 58, the upper ends of which, as best shown in Figure 3, are apertured to receive a cross bar 5I that is carried in the rear lower ends of a pair of arms 52 and 53 which at their upper or forward portions are Welded or otherwise suitably fixed to a cross shaft 54. The latter is supported in suitable bearing brackcts 55 and 56 and at one end has an arm 5I fixed thereto and connected by a link 58 to an arm 59 formed on the left side member I4 of the tractor drawbar bail I5. Connection between the front end of the link 58 and the arm 51 is effected by means of a clamping swivel 60, and a similar clamping swivel 6I serves to connect the rear end of the link 58 with the upper end of arm 59. The cross shaft 54 is held in the desired lateral position with respect to the bearing brackets 55 and 56 by a sleeve 62 abutting against the upper portion of arm 52 and by a clamp collar 63 associated with bracket 55.

The two bearing plates 55 and 56 are adapted to be readily and quickly attachable to and detachable from the tractor I, preferably the intermediate portion thereof forward of the rear axle 6. To accomplish this, the tractor carries a pair of attaching plates 68 bolted to the tractor. Each of the attaching plates 68 is provided with a forwardly facing notch II (shown in dotted lines in Figure 1) which is adapted to receive the cross shaft 54, the upper and lower edges of the notch 'II flaring downwardly and forwardly to facilitate movement of the shaft 54 and associated parts into position. Also, bearing bracket 55 is provided with a rearwardly facing notch 'I2 which is adapted to receive a stud 'I3 carried by each attaching plate 68, and bracket 5B is provided with an aperture (not shown); to receive the stud-13, the notched bearing bracket 55 facilitating each attachment or detachment vafter the stud 'I3 has engaged or disengaged the aperture in bearing bracket 56. The studs 'I3 are threaded and wing nuts "I4 are provided to secure the brackets 55 and 56 to the attaching plates 68.

The implement frame members 45 and 46 carry cam latches 'I8 especially adapted to engage the section I6 of the tractor drawbar I5. The cam latches I9 are identical, except that one is a left hand and the other a right hand unit, and it will therefore be sufcient to describe one of them, such as the cam latch associated with beam 45. A generally S-shaped bracket 80, the ends of which are substantially vertical, is attached, as by welding, to the beam 45. 'The upper end of the bracket is disposed in a vertical plane displaced laterally outwardly of the vertical plane containing the lower end of the bracket, and is disposed between the forward ends of two longitudinally extending horizontal members 85- and is fixed to them, as by welding, so as .to vpresent flushV surfaces at the forward end of the connection and at the top. The members 8l are displaced vertically upwardly from the beam 45 a distance slightly greater than the diameter of the rear transverse section I6 of the tractor Idrawbar bail I5, and are apertured near their vrear ends to receive a pivot bolt 82 upon which is .swingably mounted a cam member 83.

bar I5.

As best shown in Figure 1, the cam member 83 has a flattened top section which may rest upon the upper surfaces of members 8I, and when the cam is in this position it has a lower curved section 84, the forward edge of which is generally arcuate about a center dened by the pivot bolt 82, and which projects vertically from the flattened top surface beneath and between the lower portions of the members 8l, whereby the curved forward edge of the section 84 abuts against the rear transverse section I6 of the tractor draw- The section 84 thus serves to hold the rear transverse section I6 securely in position adjacent members 8I, bracket 88, and beam 45 irrespective of the various positions in which the drawbar I5 may be disposed by the actuation of the power lift unit 8.

Referring now to Figure 5, the reference numeral 85 denotes one of a pair of identical gussets, the lowermost parts of which are attached, as by welding, to the laterally inward sides of beams 45 and 46. The forward surfaces of the gussets 85 are formed in generally S-shaped curves, and the lower foremost parts of the surfaces blend smoothly into the top flanges of the beams 45 and 46, as shown. The uppermost surfaces of the gussets are disposed slightly above the members 8| and are contained in the same horizontal plane as the tops of the cams 83.

The operation of the preferred form of the present invention is substantially as follows.

As the implement 38 rests upon the ground, it is supported on the front rows of spring teeth 35 and the implement stand 49. As best shown in Figure 6, the latter is of such length that the beams 45 and 46 are held in an elevated position convenient to Aautomatic and unaided engagement with the bail member 50 as the tractor is backed into position.

As the tractor I is backed into position, the drawbar I5 is held slightly above its lowered position until the tractor has backed to a point where the rear transverse section I6 of the drawbar I5 is disposed to the rear of the cam latch mechanism 19. Slightly before the tractor reaches this position, the swingable bail 50 comes into contact with the implement ystand 49 and forces it to swing rearwardly and upwardly generally into the position shown in Figure 4, the bail 50 holding ythe stand 49 well out of engagement with the ground. At this position the drawbar I5 is lowered until the rear transverse section I6 engages the beams 45 and 46. As the tractor is driven forward slowly the transverse section I6 will engage the under side of the cam 83 and will force the cam upwardly until the curved surface 84 comes in contact with the section I6, at which point the cam 83 will lower into latching position and will hold the drawbar securely in place.

With the modication shown in Figure 5, as the tractor I is backed into position, the drawbar I5 may remain in a lowered position, and upon contact with the gussets 85 the drawbar will be raised by the sloping surfaces of the gussets and will slide across the tops of the cams until the tractor has reached a position where the drawbar will drop onto the beams 45 and 46. Then the tractor may be driven slowly forwardly into engagement as above described.

Because of the linkage including `bail 58, shaft 54, arm 5l, link 58, and arm 59, both the front and rear ends of the implement 30 will be raised and lowered into different parallel positions with respect to the tractor as the power lift unit 8 is actuated. Itis to be noted that as the teeth 35 This insures a rigidly connected implement durr Ving operation. v

When it is desired to lift the implement into a transport position the valve Vis operated to `cause the power lift arms l I to be swung upwardly, As

the greater weight of the implement lies rear-:i

Wardly of the bar I6, the first eiect of the lifting action is to raise the front ends of the straps 41 and 48 upwardly until they contact the upper pivot bar 5I (see dotted line position of straps 41 and 48 in Figure 3) After this contact is made,"-

further upward movement'of the arms 'Il serves to raisethe entire implement. The upward movement of the front ends of the beams 45 and 46 has the advantage `that the teeth 35 are tilted upwardly which aids .their running out of thef ground.

When it is desired to'detach the implement the in a seated position between saiddrawbar retaining members and said frame.

3. An implement adapted tobe mountedon a tractor having two fore and'aftA spaced implement-engaging bails, both swingable on the tractor generally vertically, and means for swinging said-hails, saidimplement comprising a frame, forwardly extending beams rigid with saidframe extending generally forwardlyrunderneath said tractor, one of said bails beingengageable with the front portions of said beams'as said tractor ,is driven rearwardly intoattachment position, and swingablevattaching means on's'aid frameffor detachably connecting saidframe with the 'other of said bails as said tractor is drivenl forwardly,

whereby said implement may be readily mounted j on said tractor withf-nolmanual'assistancerevalve V is actuated to move the power lift arms II to a position where the spring teeth 35 are resting on the surface of the ground. 'I'he operator thenturns the cams 83 in a clockwise direction, as viewed in Figfl, to a position in which the Vflattened top surfaces of the cams pointrdownwardly and rearwardly, and then backs the tractor far enough so that the bar I6 is disposed rearwardly of the members 8| and the cams 83. Then, after raising the drawbar slightly, the tractor may be driven forwardlyl As the tractor does so, the bail 5|] moves out of engagement with theimplement stand 49 and the latter swings downwardly.

and forwardly into ground engaging position and supports the front end of the completely disengaged implement.

The present invention is not necessarily limited to a spring tooth harrow or the like.

While we have shown and described above the vpreferred structure in which the principles of the present invention have been incorporated, it is to be understood that our invention is not to vbe limited to the particular details shown and described above, but that, in fact, widely different means within the scope of the invention may be employed in the practice of the ybroader aspects of our invention.

What we claim, therefore, and desire to secure by Letters Patent is:

1. A tractor mounted implement adapted to be mounted on a tractor having a generally vertically swingable drawbar and means on the tractor for swinging said drawbar, said implement comprising a frame, ground working tools carried on said frame, a pair of L-shaped members on said frame, each having a leg spaced vertically from said frame and extending generally rearwardly, and swingable locking means carried by said legs, said drawbar adapted to be engaged in between said legs and said frame and releasably locked therebetween by first backing said tractor, then lowering said drawbar adjacent and beneath said vertically spaced legs, and then driving the tractor forwardly to bring said drawbar into locked position between said legs and said frame.

2. An implement adapted to be attached to a tractor having a drawbar, said implement comprising a frame, a pair of drawbar retaining members on said frame, a rotatable cam pivoted to each of said members, and a stop on said cam limiting its downward movement in a forward direction and engageable with said drawbar retaining members for releasably locking said drawbar implement.

quired for supporting, guiding; or-connectingfsaid 4: "An impiement'adapted fte-be connected with a tractor having generallyltnrtically' shiftable implement engaging meansat the rear'ofithe tractor, said implement comprising a "frame adapted to pass underneath said implement engaging means when the latter is'raised', rearwardly facing attaching means on said frame adapted to receive said engagingA means after the latter in its raised position has been passedV over said attaching means and then lowered and the tractor then driven forwardly, andmeans on said frame for releasably connecting said implement engaging means in said rearwardly facing 'attaching means. j

5. An implement adapted` to be mounted on'a tractor having two fore and aft spacedgenerally vertically shiftable bails, said implement comprising a frame, a forwardly extending beam rigid with said frame adapted to extend generally forwardly underneath said tractor, a swingable implement stand pivotally connected with the forward portion of said beam, said stand being connected to the beam in such position that one of said bails is engageable with the front portion of said beam and swings said implement stand i rearwardly'out of ground engaging position as said tractor is driven rearwardly over said beam into attachment position, swingably attachable means on said frame for detachably connecting said frame with the other of said bails as said tractor is driven forwardly, whereby said implement may be mounted on said tractor with no manual assistance required during the attachment operation.

6. An implement adapted to be connected to a tractor having a drawbar, said implement comprising a forwardly extending frame, ground working tools thereon, a vertically swingable implement stand pivotally connected to the forward portion of said frame whereby said implement is supported by said tools and said stand when in an inoperative position, and self-locking means on said frame for detachably connecting said frame to said drawbar when the tractor is driven into position to receive the implement, and means adapted to be attached to the tractor forward of the drawbar for connecting `the forward end of the frame with the tractor, said means being spaced so as to swing said implement stand out of engagement with the ground when the tractor is moved relative to the implement into said position. Y

7. Implement-attaching means for attaching an implement frame to a tractor having a vertically swingable drawbar carried by said tractor and means on said tractor for swinging said drawbar, .said implement-attaching means comprising a pair of liftingggussets onbsaid'frame, a

pair of L-shapedmembers on said-frame, each of the latter havingv a leg spaced verticallyfromsaid frame -and extending generally rearwardly, land `swingable locking means, carriedpysaidflegs, said drawbar'adaptedto be movedvalong saidframe, raisedby said gussets, droppedb'ehind ISaid .legs

kand engaged and 'releasably locked -between said A:legs vand said frame ,by rstbacking. said `tractor and thendriving saidtractor forwardly.

`8. lImplement-attaching v:means for y attaching said frame and extending generallylrearwargly,

and vswingable locking meansarriedby said. legs, sa id vdrawloar adapted Yto be -moved alongaid frame, dropped behind said legs-and engaged and releasably locked between said legs and-saidframe by first backing said tractorand then driving said tractor forwardly. f

`9. The inventionset forth in claim 5,7fiurther characterized bysaid implement standbeingconnected tothe implement frame in vsucl'lmposition -that the -forward tractor bailvengages and holds -said stand in raised position .after thetractorhas been drivenforwardly-relative to the implement a distance Jsuicient to cause saidswirigablyfattachable means to connect the implementgtoftlle rear tractor bail. y

10. implementI adapted fior attachment toy a tractor having a rear axlestructure and a drawbar bail member swingable ,by power generally lvertically, said f implement omprisng generally forwardly extending fframemeans adapted teo-.be disposed nnderrreath `rtine tractor when the latter is backed over the implement, a drawbarfreceivv fingg braclvet 1 having arearwardlyfacingY hQol-'7'like .section on V the upper.. sideof thefre'ar portion y.of saidframe means.,51saidfhook-lilfzesection.e being so constructed andarranged that `when the rvtractor islloackedas aforesaidrwith the drawbar raised, "the latter clears fthe bracket and the Y.drawbvar may begloweredin a lposition rearwardly of!v aid bracket wherenpqn' forward movementof said tractor Abrings saidfldrawbar into engagement withsaidhQQkvlileisectiQn. y I

The following references are of record inthe Vleiofzthiszpatent:

- UNITED STATESRPATENTS 

